2.
Grand Central Terminal, under construction in this photo believed to be taken between 1905 and 1915, was opened in 1913.
Detroit Publishing Co. via Library of Congress

3.
The first train left Grand Central Terminal just after midnight on Feb. 2, 1913. One hundred years later, the terminal is the second-most visited attraction in New York City, behind Times Square, according to the Metropolitan Transportation Authority.
Bain News Service via Library of Congress

4.
The west balcony of Grand Central Terminal is pictured between 1910 and 1920. Grand Central Terminal is “truly one of the greatest buildings in this country if not the world,” said Justin Ferate, a longtime New York tour guide.
Detroit Publishing Co. via Library of Congress

5.
“Grand Central is a major icon in the city,” said Anthony Robins, author of “Grand Central Terminal: 100 Years of a New York Landmark.” “(It) just has this breadth and scale and sense of grandeur that you can’t be in that part of town and not notice it.”
Detroit Publishing Co via Library of Congress

6.
Passengers are seen moving through Grand Central Terminal in this photo published in 1941. The terminal is often – and incorrectly – referred to as Grand Central Station. “I always say, if you call it Grand Central Station, then everyone knows you’re a tourist,” Ferate said.
John Collier / Library of Congress

7.
This 1930s photo shows a large group of pedestrians walking on the sidewalk below as cars drive above on the bifurcated and elevated section of Park Avenue which goes around Grand Central Terminal at the second floor to alleviate congestion.
FPG via Getty Images

8.
A mural, aimed to promote the sale of defense bonds and designed by the Farm Security Administration, is seen in the concourse of Grand Central Terminal in 1941.
Arthur Rothstein / Library of Congress

9.
A salesman at Grand Central Terminal makes his way toward 42nd Street in this 1950s photograph. Today, about 750,000 people move through Grand Central every day, MTA estimates.
Orlando / Three Lions via Getty Images

10.
Each block of stone on the floor of Grand Central Terminal is one walking step wide and one running step long, and each a slightly different color, Ferate said, and is designed to accommodate the human form.
Popperfoto via Getty Images

12.
A 63-foot tall, 5-ton Redstone rocket was displayed at Grand Central Terminal in 1957. “They had exhibits of all kinds at all times … because it’s the great big public space that everybody knew,” Robins said.
Walter Sanders / Time Life Pictures via Getty Images

13.
People walk through Grand Central Terminal during the morning rush in Manhattan on Nov. 1, 2012. Subway train service in the New York City was running at limited capacity following the system's shutdown caused by Superstorm Sandy.
Mario Tama / Getty Images

14.
The clock on the south facing side of Grand Central Terminal strikes noon March 29, 2012.
Mike Segar / Reuters

16.
People use the ramp at Grand Central Terminal on Jan. 25, 2013. Grand Central had an extensive facelift in the 1990s and was nearly demolished about 55 years ago.
Brendan McDermid / Reuters

17.
Commuters move through the grand hall of Grand Central Terminal on Jan. 25, 2013. The terminal, opened to the public 100 years ago, was then called the greatest railway terminal in the world and had an $80 million price tag.
Brendan McDermid / Reuters

18.
Grand Central Terminal is known for its “constellation ceiling” that depicts a starry sky and signs of the zodiac.
Brendan McDermid / Reuters

19.
A small grey rectangle, pictured on Jan. 29, 2013, shows the darkened color of the marble and ceiling in the main concourse of Grand Central Terminal before it was restored in 1998. The dark spot was caused by cigarette smoke, Ferate said.
Justin Lane / EPA

21.
The clock at the center of Grand Central Terminal’s main concourse is pictured on Jan. 29, 2013. “Grand Central has been made into a vast new destination for New Yorkers,” Robins said. “Most of the people in the terminal at any given moment are probably not going to a train, they’re in to shop, to buy food, to go to a restaurant, to go to the Apple store.”
Justin Lane / EPA

22.
Giant power transformers sit seven stories below the main concourse in the power plant of Grand Central Terminal.
Brendan McDermid / Reuters

23.
Commuters move through the grand hall of Grand Central Terminal on Jan. 25, 2013. New York City is celebrating the 100th birthday with a public rededication ceremony, live performances and the opening of the “Grand by Design” exhibit.
Brendan McDermid / Reuters

24.
Park Avenue south direction is pictured from a view looking out from the Tiffany clock over Park Ave and 42nd Street at Grand Central Terminal on Jan. 25, 2013.
Brendan McDermid / Reuters